Decorative stitch attachments



Sept. 13, 1960 G. BAEHR ET AL 2,952,228

DECORATIVE STITCH ATTACHMENTS Filed July 2o, 1956 4 Sheets-Sheet l zzaIza l /20/07 ua INVENTORS ATTORNEYS Sept. 13, 1960 c. G. BAEHR en -Ax.DECORATIVE STITCH ATTAcHMENTs 4 Sheets-Sheet 2 Filed July 20, 1956 QJZM.. ao 4 O 5 3G \l Fo I 5 4 5 6 77 oo fm d A .M "l 8 ,MW ww n .1.. AIOIW 7. -j 5e ww l o U .IIZ m l Ilm# ..../4 7 3 .QM

ISI/g5 gun/f 6;. INVENTORS @y j-M M ATTORNEYS Sept. 13, 1960 c. G. BAEHRETAL 2,952,228

DECORATIVE STITCH ATTACHMENTS Filed July zo, 195e 4 sheets-sheet :s

INVENTORS oRNEYa Sept. 13, 1960 c. G. BAEHR ETAL DECORATIVE STITCHATTACHMENTS 4 Sheets-Sheet 4 Filed July 20, 1956 5 q e4 44 3,2/0 4/73;)3 M108 i INVENTORS L ATTORNEYS,

nfed States Patent 0153@ Patented sept. 13, 1960 2,952,228 DECORATIVESTITCH ATTACHIVIENTS Carl G. Baehr, West Haven,

Haven, Conn., assignors to The Greist Manufacturing Company, New Haven,Conn., a corporation ol? Connecticut Filed July 20, 1956, Ser. No.599,272 Claims. (Cl. 112--160) This invention relates to sewing machineattachments and more particularly to an attachment adapted to be appliedto the ordinary household sewing machine and arranged to effectdecorative stitching in any one of a number of patterns. Devices of thischaracter have usually comprised a frame portion which may be secured tothe presser bar of a sewing machine, the frame having pivoted thereto alever on which the presser foot is car-l ried, this lever being mountedfor transverse or zigzag movements so as to move the cloth laterallywith respect to the sewing machine needle in addition to thelongitudinal movement effected by theusual feed mechanism. The leverwhich carries the presser foot is ordinarily actuated by a rotatable cammember actuated in a step-bystep movement by means of a fork armattached to the needle bar of the sewing machine, the cam member usuallyhaving a cam track in which is engaged a pin or follower attached to thelever.

It is desirable to provide an attachment whicllsmay produce a variety ofdifferent sewing patterns, and in the past this has sometimes beenaccomplished by providing a plurality of cam members or -by providing asingle cam member and some means for varying the movement of the cam bythe fork arm. In such devices it is usually necessary, in order to electa change in the pattern of stitches, to disassemble at least a part ofthe device and substitute a different cam or different means foractuating the cam for the one which has been previously employed. Theseoperations are not as simple as could be desired, and it is sometimesdiicult to set the attachment for the pattern which is desired withoutexperiment.

It is contemplated by the present invention to provide an attachment forsewing machines wherein the stitch pattern may be varied merely by anadjustment of the mechanism built into the attachment so that it isunnecessary to remove and replace any of the parts. With such anarrangement a number of separate parts do not have to be provided and,as such separate parts are apt to -be lost, it is desirable that all ofthe mechanism be permanently incorporated in the attachment itself. Alsoby a simple movement or change in the position of an adjusting member orcontrol member the pattern of the stitching effected by the device maybe varied and thus the attachment is more easily manipulated than thosein use at the present time.

Moreover provision is made for a considerable variation in the patternsof decorative stitching which may be eected by the attachment. Forexample, plain zigzag stitching may be effected where a transversemovement of the presser foot is accomplishedv upon each reciprocation ofthe needle bar. This, however, can be varied so that zigzag movementsare effected every other stitch or every third stitch, or in any desiredsequence.

v In addition it is sometimes desirable that the number of stitchesbetween each transverse movement is not uniform and also that themachine may stitchY through the goods a plurality of times during thetransversemovement and Charles Curello, East from one extreme to theother so that intermediate stitches may be elected during a completemovement of the presser foot from its extreme lateral position on oneside to the extreme lateral position at the other side of the path ofthe needle. All of these varieties of stitches may be elfected by thepresent attachment.

One object of the present invention is to provide a new and improveddecorative stitch mechanism -for sewing machines in the form of anattachment which may readily be employed with the ordinary domestichousehold sewing machine.

A further object of the invention is to provide a new and improveddecorative stitch mechanism for sewing machines wherein the stitchpattern may be readily and easily varied by mechanism which is apermanent part of the attachment.

Still another object of the invention is to provide a decorative stitchattachment of the character described having a plurality of cams tocontrol the oscillation of the presser foot of the attachment, thearrangement being such that any one of a desired number of cams may bebrought into position to control the lever upon which the presser footis mounted.

Still another object of the invention is to provide a decorative stitchattachment of the character described wherein a number of controllingcams are arranged in a bank upon the device and a follower is providedwhich may be movable along the bank of cams into operative relation withany selected one of the cams, this follower being operatively connectedwith a pivoted lever upon which the presser Ifoot of the attachment iscarried so thata desired stitch pattern will be effected.

To vthese and other ends the invention consists in the novel `featuresand combinations of parts to -be hereinafter described and claimed.

In the accompanying drawings: f Fig. 1 is a side elevational view of adecorative stitc attachment embodying our invention with the coverremoved to show the interior mechanism;

Fig. 2 s a similar view of the other side of the device with some partsbroken away;

Fig. 3 is a top plan View of the structure;

Fig. 4 is a bottom plan viewv of the device;

Fig. 5 is a longitudinal sectional view on line 5 5 of Fig. 3;

Fig. 6 is an elevational view of the rear part of the attachment similarto Fig. l but showing the cam follower in another position;

Fig. 7 is a sectional view on line 7-7 of Fig. 1;

Fig. 8 is a transverse sectional View on line 8 8 of Fig. l;

Fig. 9 is a top plan view of the actuating slide;

` Fig. 10 isv a perspective view of the U-shaped frame member whichcarries the cam follower;

, Fig. l1 is a side elevational View of the cover; and

Fig. l2 is a perspective view of one of the actuating levers Vof the camfollower. f

To illustrate a preferred embodiment of the invention there is shown inthe drawings an attachment comprising a frame member 10 having aforwardly extending portion 11, the sides of which are bent upwardly tocrank 17 having a crank arm 18 to be referred to herein-- after, thearrangement being such that reciprocation ofl Y 3 needle bar will effectoscillatory movement of the crank arm 18.

The presser foot is indicated at 20, the foot being carriedv at theforward end of a lever 21 which, as shown more especially in Fig. 5, isprovided with a slot 22 in which is slidably received a pin 23, this pinbeing also slidable in a slot 24 in the forwardly extending arm 11 ofthe frame. The pin 23 is carried by an adjusting plate 25 (Figs. 4 and5), which plate is adjustably mounted on the lower side of the frame,and for this purpose the plate is provided with an arm 26 (Fig. 2)adapted to receive a screw 27 slidable in a slot 28 on a ange 29 of theframe member 10. With this arrangement, when the screw 27 is loosened,the adjusting plate 25 may be moved to and fro with respect to the frameto adjust. the position of the pin 23 and, therefore, adjust the throwof the presser foot. The screw 27 is threaded into a block 38 on theside of the flange 29 which is opposite that of the arm 26.

Slidably mounted upon the upper surface of the frame member 18 is anactuating slide 32 (Figs. 7 and 9). This slide is provided with anelongated opening 33 which receives screws 34 secured to the frame plate10 and is also provided with another guide slot 35 to receive a pin 36secured to the frame plate. In this manner the slide is operativelyconnected to the plate for sliding movement thereon. Adjacent itsforward end the slide 32 is provided with an upstanding bifurcatedflange 37 having an open-ended slot 38 between the forks thereof inwhich slot is received the crank member 18 of the crank 17 previouslydescribed so that reciprocation of the fork arm 16 effects reciprocationof the slide 32.

Upon this slide is pivotally mounted at 40 a pawl 4l, the forward hookedend 42 of which is urged by a spring 43 into engagement with the teethof a ratchet wheel 44 (Fig. 7) rotatably mounted on the attachment aswill be hereinafter explained. This spring has a downwardly turned end43@L which normally engages over the back of the pawl 41.

Also pivotally mounted at 45 on the plate 32 is a lever 46 having a noseportion 47 bearing against the tail 48 of the pawl 41 so as to, whendesired, swing the pawl about its pivot into position where it no longerengages the ratchet wheel 44. The lever 46 may be provided with a detent49 (Fig. 7) adapted to engage in openings 50 in the slide 32 to hold itin position to which it is moved. When the pawl is moved to disengagingposition, straight sewing is effected by the attachment.

Pivotally mounted upon the frame plate at 52 is a substantially U-shapedauxiliary frame member comprising an upright portion 53, a horizontallyextending portion 53@ adjacent the base plate 10, and a secondhorizontally extending portion 54 spaced upwardly from the base plate. Ascrew 54a secured to the portion 53a is slidably received in an arcuateslot 5419 (Fig. 7) in the base plate to guide this member in itsmovements. Secured in this member are posts -55 and 56, and upon each ofthese posts are rotatably mounted a plurality of cams 57 and 58, thecams of one bank being held together by screws 59 and those of the otherbank by screws 60 so that the camsk of each bank will rotate in unison.

Also rotatably mounted on the post 56 is the hub 61 of the ratchet Wheel44, and a pin 63 disposed in registering openings in the bank of cams 58extends downwardly into this ratchet wheel and connects it nonrotatablyto the bank of cams. extends through a gear 64 mounted on the hub 61 ofthe ratchet wheel so that the bank of cams, gear and ratchet wheel arelocked together.

Similarly a gear 65 is mounted on a hub 66 embracing the post 55, andthis gear is secured to the bank of cams 57 by screws 59 and a drivingpin 67 which extends downwardly through the cams into the gear. A pinion68 is rotatably mounted upon a shaft 69- adjacent the lower portion ofthe U-shaped frame member and the This pin as Well as the screws 60alsoV teeth of this pinion mesh with those of the gears 64 and 65, asshown in Fig. 7. With this construction it will be seen that as theslide 32 is reciprocated the pawl 41 will rotate the ratch wheel 44 in astep-by-step movement and rotation of this` ratchet wheel will in turneect rotation of the gear 64, the pinon 68 and gear 65, resulting in therotation of both banks of cams 57 and 58.

The shaft 69 extends upwardly through the frame member 54 so that thepinion 68 may be rotated by hand, if desired, and for this purpose at-urn button 78 is threadedly connected to the shaft 69 at 71.

As stated, the U-shaped frame member carrying the bank of cams ispivotally secured to the frame plate 10 so that it may be rocked aboutits pivot so that the cams may be disengaged from the cam followerhereinafter described. This frame may be locked in place by means of avertical lever 72 pivoted to the frame member 53 at 73 (Fig. 8) androtated about this pivot by a manually manipulatable arm 74 which issecured to the lever 72. As shown in Figs. 2 and 8, the lower end ofthis lever is adapated to be engaged in a slot 7'5 in the frame plate 10and the upper end of the lever engaged in a slot 76 in the arm 77 of aU-shaped member having a vertically extending portion 78 and ahorizontally extending portion 78g4 secured to the base plate by screws,one of which is shown at 78". This member also has a portion 79 spacedupwardly from` the base plate. A spring 80` secured at one end to an arm81 on the lever 72 and at the other end to a post 82 (Fig. 7) on thevertical portion 53 of the U-shaped frame which carries the cams,normally holds the lever 72 in its` locking position. The arm 81 extendsinwardly through an arcuate slot 83 in the member 53.

As will K.be understood, when it is desired to move the bank of cams`about the pivotal connection 52 of the U-shaped frame, the lever 72 maybe swung in a counterclockwise direction, as shown in Fig. 2, aga-instthe tension of the spring 88 so as to dsengage the ends of the leverfrom the slots: 75 'and 76. When the cam-carrying `frame is swung tothis inoperative position, as shown in dotted lines in Fig. 3, the lowerend of the lever 72 will Iride .upon a solid portion of the plate 18 sothat when the frame is moved back to its full-line position shown inthis figure the spring 801 will cause the lever to snap automaticallyinto p-lace.

The exact operative position of lthe U-shaped camcarrying frame may bedetermined by a stop screw 85 eccentrically mounted in the horizontalportion 54 of this lframe (Fig. 3) which screw engages against ashoulder 86 on a part of -the frame member 77 The manner of rotating thecams from the reciprocation of the needle bar has been described aboveand descripftion will now be given of the manner of controlling thepivotal movements of the presser yfoot lever 2l by the rotation of thepairs of cooperating cams, one upon each ibank. It may here be notedthat the cams 57 and 58 are :arranged in horizontally aligned pairs andthese cams are complemental to each other so that a follower member tobe hereinafter described will be held in engagement with one of lthe ca-ms by the operation of the cooperating cam, as shown, for example, inFig. 7, from which it will be seen that a protuberance on one cam liesupon a depression or concavity upon the periphery of a cooperating camupon the -other bank so that each end of a pivoted follower to behereinafter described will always be held in engagement with itscooperating cam.

The presser Ifoot ylever extends rearwardly, as shown more especially inFig. 5, and is provided with an offset portion 87 extending over theframe plate 10. To this end `of the presser foot lever is pivoted at 88-a link 89 (Fig. 7), the other end of which is pivoted to a verticallydisposed rod 90 secured in arms 91l and 92 of a U-shaped rocker member93. This rocker member is rocka'bly mounted by means of openings 94 and95 upon a shaft 96 secured in the frame members 77 and 79 (Fig. 8).Rockaccesos IJ in'g or oscillation of the member 93 will by means of thelink 89 effect lateral movements of the rear end of the presser footlever 21 'and rock this lever about its pivot 23 on the frame.

Slid-ably and rockably mounted upon the shaft 96 is a cam follower 97,this member being carried by a hub 98 (Fig. 8). T'he cam follower, asshown in Fig. 7, comprises an elongated body portion 99 having followerporftions 100 and 101 :at its ends, the follower 100 being adapted toengage one of the cams 57 while the follower '1 is adapted to engage aselected one of the cams 58. The follower is lalso provided with an ear102 which embraces the rod or shaft 90 on the rocker 93 so that rockingof the follower member about the shaft 96 by its engagement with thecams 57 and 58 will effec-t oscillation of the rocker 93 to which therod 90 is secured.

It will, of course, be understood tha-t in general each of the cams 57will have a different peripheral configuration as will also each of thecams 58, and in order to change from one stitch pattern to 'another itwill be necessary to bring the follower member 97 into cooperativerelation with `different ones of the pairs of cams in the two banks. Tothis end the hub 98 is provided with a groove 105 into which extend thebifurcated end members of ya slide 106 (Fig. 8), this slide beingslidably mounted on the frame member 78 by means of a pin 107 threadedlysecured to the slide 106 and having a body portion 108 received in aslot 109 in the member 78. The pin 107 has an enlarged head 110 and aspring 111 is mounted between this lhead and the member 78 at the edgesof the slot 109. An end portion 112 of this spring extends into the slot109 to assist in guiding the slide 106 in its movements.

As shown more especially in Figs. 7, 8 and l2, the inner end of the pin107 is engaged by the fork 113 of ya lever 114 (Fig. l2) pivoted to apart ofthe frame mem-ber 78 at 115. This lever is provided at its rearend'with a Ilug 116 which is received in the bifurca-ted end 117 of :anadjusting lever 118 also pivoted to a portion of the lframe 78 at 115.

With this construction it will be seen that -as the lever 118 is -swungabout its pivot 115, the actuating lever 114 will likewise be movedabout the :same pivot and on account of the engagement of the forked end113 of the latter lever with the pin 107, fthe slide 106 and, therefore,the cam follower will be moved upon the shaft 9610 effect its engagementwith `any selected pair of the coopera-ting cams.

In order to hold the lever 118 in a predetermined position to which itmay be moved, this lever is provided with an offset portion 120 (Fig.7), land extending through slots 121 in this portion of the lever is aslide '122 which is urged toward the rear end of the lever by lthespring 123, one end of this spring being connected to a pin 124 on theslide and the other end to Ia pin 12S 0n the lever. The forward end ofthis slide is of U-shaped form, as shown at 126, to embrace an edge ofthe frame member 78 and is provided with a detent 127 adapted tocooperate with the teeth of a toothed segment 1-28 (Figs. 1 and 3)provided on the portion 78 of the frame. rl`he segment 128 is of-arcuate form, the arc of which is described about [the pivot 115. Theslide is provided with a finger piece 1,29, and it will be seen Ithat bydrawing this finger piece to the left, as shown in Figs. l, -3 and 7,the detent 127 will be freed from the toothed segment 128 so that thelever '118 may be moved to any desired position. Upon release of thelinger piece the detent will again engage the toothed segment `and holdthe lever and, therefore, the follower in the predetermined -selectedposition to effect the desired stitch pattern.

A T-shaped reinforcing member 130 may be secured to the frame 10, asshown in Figs. 5 and 7, the body portion of this member extending overthe rear portion 87 of the presser foot lever 21 and an elongated slot131 is provided in this member through which the pivot pin 88 extends,Ithis slot permitting movement of the pivot pin during oscillation ofthe presser foot. The forwardly extending arm 132 of the member 130 -issecured to the forward extending arm 11 of the frame.

A cover may be provided for the device, .as shown at 134 in Fig. 11.This cover may be secured to the frame in any desired manner and, asshown, is provided with an arcuate slot 135 through which the nger piece129 extends, the slot being of sufficient width -to allow movement ofthe ringer piece from ful-lto dotted-line position, shown in Fig. 7.Adjacent this slot indicia 136 may be provided to indicate theparticular pair of cams with lwhich the follower is in engagement uponyany given position of the lever 118.

From the above it will be apparent that the follower portions 100 andr101 of the cam follower may by movement of the latter along the shaft96 be placed in engagement with any selected pair of cams 57 and 58 toproduce the desired decorative stitch pattern. When the sewing machineis then operated, the fork arm 16 will be reiprocated by the needle barand effect reciprocation of the slide 32. The pawl 41 by engagement withthe ratchet wheel 44 effects rotation of both banks of cams which inturn serves to rock the cam follower about its pivot 96. As the camfollower is connected to the rod of the rocker member 93, oscillation ofthe follower will effect rocking movement of this rocker member aboutthe shaft 96. As the link 89 is connected to the -rod 90, movement ofthe rocker member will effect oscillation of the presser foot 21. Theoscillations of the presser foot are, therefore, controlled by the camsso that the configuration of the latter will determine the particularstitch pattern produced by the attachment.

l While we have shown and described one embodiment of our invention, itwill be understood that it is not to be limited to all of the detailsshown, but is capable of modification and variation within the spirit ofthe inventionY and within the scope of the claims.

What we claim is:

l. A decorative stitch attachment for `sewing machines comprising a mainframe, a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, and a' bank of cams rotatablymounted on said auxiliary frame for selective engagement by saidfollower, and means for releasably holding said auxiliary frame inposition on Said main frame comprising a spring-urged latching memberpivotally mounted on the auxiliary frame for movement to positions toengage and disengage a part of the main frame.

2. A decorative stitch attachment for sewing machines comprising a mainframe, a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe land operatively connected to said lever, an auxiliary framepivotally connected to said main frame, and a bank of cams rotatablymounted on said auxiliary frame for'selective engagement by'saidfollower, means for releasably holding said auxiliary frame in positionon said mai-n frame comprising a latching member pivo'ted between itsends on the auxiliary frame, and means on the main frame engages.

3. A decorative stitch attachmentfor sewing machines comprising a mainframe, a presser foot lever pivotally mounted on the iframe, means foroscillating 'said lever comprising a cam follower rockably mounted onthe frame and operatively connected to said lever, an auxaliary framepivotally connected to said main frame, and a bank of cams rotatablymounted on said auxiliary frame for selective engagement by saidfollower, means for releasably holding said auxiliary frame in positionon said main frame comprising a latching member pivwith which each endof said memberotally mounted on the auxiliary frame for movement tolatching and unlatching position, said main frame having a slot in which`an end of said member engages, and spring means urging said member tolatching position.

4. A decorative stitch attachment for sewing machines comprising a mainframe, a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, and a bank of cams rotatablymounted on said auxiliary frame for selective engagement by saidfollower, means for releasably holding said auxiliary frame in positionon said main frame comprising a latching member pivotally mounted on`the auxiliary frame for movement to eng-age and disengage a part of themain frame, and a stop member adjustably mounted on one of said framesagainst which a part of the other frame engages to locate the auxiliaryframe.

5. A decorative stitch attachment for sewing machines comprising a mainframe, a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, and a bank of cams rotatablymounted on said auxiliary frame for selective engagement by saidfollower, means for releasably holding said auxiliary frame in positionon said main frame comprising a latching member pivotally mounted on theauxiliary frame for movement to latching and unlatching position andadapted to engage a part of the main frame, and a stop member adjustablymounted on one of said frames against which a part of the other yframeengages to locate the auxiliary frame, said stop member comprising ascrew eccentrically threaded into said one frame.

6. A decorative stitch attachment for se-wing machines comprising a mainframe, a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, a bank of cams rotatably mountedon said auxiliary frame, and means movably mounting said earn followeron the main frame `for sliding movement in a direction axially of saidcams to engage a selected one thereof, and means to move said followercomprising a slide on the main frame engaged with the follower, and amanually operated lever connected to the Slide to move the latter.

7. A decorative stitch attachment for sewing machines comprising a mainframe, a. presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, lan auxiliary framepivotally connected to said main frame, a bank of cams rotatablymountedv on said auxiliary frame, and means movably mounting said camfollower on the main frame for sliding movement in a direction axiallyof said cams to engage a selected one thereof, means to move saidfollower comprising a slide on the main frame engaged with the follower,-a manually operated lever pivoted on the frame vand connected to saidslide to move the same, and interengaging means on the frame and leverto hold the latter in position to which it is moved.

8. A ldecorative stitch attachment for sewing machines comprising a mainframe, a presser fcotlever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, ary frame pivotallyconnected to said main lframe, a bank of cams rotatably mounted on saidauxiliary frame, and means movably mounting said cam follower on themain frame for sliding movement in a direction axially of said cams toengage a selected one thereof, and means to move said followercomprising a slide on the main frame engaged with the follower, a firstlever pivoted on the frame and engaged with said slide, a second leverpivoted on the frame and engaged with said first lever, manuallyengageable means on said second lever by which the same may be moved,and interengaging means on the frame and said second lever to hold thelatter in position to which it is moved.

9. A decorative stitch attachment for sewing machines comprising a mainframe, `a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, a bank of cams rotatably mountedon said auxiliary frame, and means movably mounting said cam follower onthe main frame for sliding movement in a direction axially of said camsto engage a selected one thereof, means to move said follower comprisinga slide on the main frame engaged with the follower, a first leverpivoted on the frame and engaged with said slide, a second lever pivotedon the frame on an axis coincident with that of the rst lever andengaged with said first lever, manually engageable means on said secondlever by which the same may be moved, and interengaging means on saidframe and second lever to hold the latter in position to which it ismoved.

10. A decorative stitch attachment for sewing machines comprising a mainframe, `a presser foot lever pivotally mounted on the frame, means foroscillating said lever comprising a cam follower rockably mounted on theframe and operatively connected to said lever, an auxiliary framepivotally connected to said main frame, a bank of cams rotatably mountedon said auxiliary frame, and means movably mounting said cam follower onthe main frame for sliding movement in a direction axially of said camsto engage a selected one thereof, means to move said follower comprisinga slide on the main frame en-y gaged with the follower, a first leverpivoted on the frame and engaged with said slide, a second` leverpivoted on the frame on `an axis coincident with that of the rst leverand engaged with said first lever, manually engageable means on saidsecond lever by whichthe same may be moved, and interengaging means onsaid frame land second lever to hold the latter in position to which itis moved, said last-named means comprising `a spring-urged slide on thesecond lever having a detent thereon and ai toothed segment on saidframe with which said detent is 'f engaged'.

References Cited in the file of this patent g UNITED STATES PATENTS anauxili-V

